Chancellor Rachel Reeves has stated that Andy Burnham must have a "worked-through plan" for governing Britain upon entering Downing Street. Reeves, speaking in what may be one of her final major broadcast interviews as Chancellor, emphasized the difficulties of governing the nation.

"Governing is hard in Britain, and lots of challenges and shocks will come his way," Reeves said during an appearance on the BBC's Sunday With Laura Kuenssberg program. She added that Burnham needs to be "really clear about what they want to achieve" and "stay laser-focused on those things that have always motivated him."

Burnham is expected to become prime minister soon, as he is the only candidate in Labour's leadership contest to succeed Sir Keir Starmer. His transition to the role could occur as early as July 20.

Reeves' comments follow remarks from Morgan McSweeney, former chief of staff to Sir Keir Starmer. McSweeney suggested that the Labour party did not adequately prepare for governing in the run-up to the general election. He indicated that the party had not engaged in sufficient top-level discussions about the implications of a "very different era" compared to previous Labour governments and the necessary reforms for the state.

"We didn't have enough conversations at the top of the party about what that meant, how to prepare for it, what that meant for the state, how the state needed to be reformed, because in lots of ways the state is really out of shape and is unable to deliver for people," McSweeney stated in an interview with the BBC's Political Thinking with Nick Robinson podcast.

Reeves is anticipated to deliver a final major address to the City of London on Tuesday, known as the Mansion House speech. When asked about the reasons for Sir Keir Starmer's premiership ending, Reeves cited public impatience for change. "People are impatient for change – I'm impatient for change and I totally get that people want to see their lives changed faster," she said.

Names such as Ed Miliband, the Energy Secretary, and Yvette Cooper, the Foreign Secretary, are reportedly being considered by MPs as potential successors to Reeves as Chancellor.